Answer
$p=2, 3$
Work Step by Step
$(p+2)^2=9(p+2)-20$
$(p*p+p*2+2*p+2*2=9p+18-20$
$p^2+4p+4=9p-2$
$p^2-5p+6=0$
$(p-2)(p-3)=0$
$p-2=0$
$p=2$
$p-3=0$
$p=3$
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